One of the few fans to see Britney Spears’s dress rehearsal of her Circus show at the New Orleans Arena Monday night tells PEOPLE that the pop star did not disappoint.

“She really delivered,” said Libby Davis, 27, of Baton Rouge radio station WFMF, which gave away tickets to the late-night rehearsal. “There were only 150 people there, but she put on a great show.”

As for how Spears looks, Davis says, “Her body is definitely back. We could see her arm and leg muscles from where we were sitting. In typical Britney fashion, the costumes were pretty scanty. It was Cirque du Soleil meets Moulin Rouge.”

Davis’s group waited through the first dress rehearsal for family and friends, which they could hear but not see. Once inside, “Everybody was chanting, ‘Britney, Britney, Britney,’ screaming, ‘We support you, Britney,’ ” says Davis.

“She put on the entire show as if it were a full house. She catered to us,” adds Davis. “She even stopped during ‘Womanizer’ because she realized we couldn’t see her. She said, ‘Let’s do it over.’ “ 

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